2013 SSANGYONG TURISMO ESP

09-54891-01
2. FUNCTION
1) Term Definition
ABS: Anti-Lock Brake System ▶
When the brake pedal is abruptly depressed, the HECU calculates the slip ratio of each wheel based
on information received from the wheel speed sensors and controls the hydraulic module data quickly
and precisely in order to maintain the friction between the road surface and tire optimal (static friction).
Therefore, by keeping the friction between the road surface and tire optimal, it is possible to obtain
following effects: Enhanced steering stability, improved direction stability, reduced stopping distance
and etc.
EBD: Electronic brake-Force Distribution ▶
This is to detect the tire speed from the wheel speed sensor in order to supply the braking pressure to
the rear tires individually. In other words, the HECU measures the tire deceleration speed continuously
and controls the rear inlet valve on the hydraulic modulator to obtain optimal braking force as much as
possible. Thereby, stopping distance, braking effect and straight stability are improved.
ESP: Electronic Stability Program ▶
This is used to make the vehicle stabilized to recognize the emergency driving conditions, and to
control the brake for each wheels and the engine power when the brake system or acceleration will not
work any more in dangerous circumstances.
TCS: Traction Control System ▶
When the wheel is slipping due to an excessive engine torque while starting off or driving, this controls
the driving force (braking force + engine torque) in order to prevent the wheel from slipping through the
engine or brake control.
AYC: Active Yaw Control ▶
This has been developed to help a driver avoid danger of losing control of the vehicle stability due to
understeer or oversteer during cornering, which is a part of the ESP function.
HBA: Hydraulic Brake Assistant ▶
Developed based on the fact that elderly drivers depress the brake pedal too soft even when hard
braking is necessary, this an assist system to operate the HECU drive motor immediately and apply
high braking force to the wheels when the brake pedal is depressed softly and the vehicle should be
braked in emergency.
ARP: Active Rollover Protection ▶
This is a supplementary device for safety in ESP system and can help minimize the rollover accidents
by detecting a potential rollover situation through the brake and engine control when making sudden
lane change or turning sharply by adding only the software, without any separate device or switch.

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2) Component Overview By System
Function Vehicle with ABS Vehicle with ESP
ABS Yes
Yes EBD Yes
TCS
No AYC
HBA
ARP
3) Part Overview By System
Part Vehicle with ABS Vehicle with ESP
HECU
Yes Yes Front wheel speed sensor
Rear wheel speed sensor
ABS warning lamp
EBD indicator lamp
G sensor (integrated in HECU) 4WD: Yes, 2WD: No No
Sensor cluster (Yaw rate sensor +
lateral sensor+ G sensor)
No Yes ESP operation indicator lamp and
warning lamp
ESP OFF switch and indicator
Steering wheel angle sensor

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3. PRECAUTIONS
The warning lamp flashes and warning beep sounds when the ESP is operating
When the ESP operates during vehicle movement, the ESP warning lamp on the instrument
panel flashes and beep comes on every 0.1 second. The ESP system is only a supplementary
device for comfortable driving. When the vehicle exceeds its physical limits, it cannot be
controlled.
Do not rely on the system. Keep on the safe driving.
Feeling when ESP is working
When the ESP system activates, the feeling can be different depending on vehicle driving
conditions.
For example, you will feel differently when the ESP system is activated during the ABS is
operating with the brakes applied and when the brakes are not applied on a curve.
If the ESP system operates when the brake is applied, the brake pressure will be increased on
the corresponding wheel which already has braking pressure for the ESP controls.
Noise and vibration that driver feels when ESP system is operating
The ESP system may transfer noise and vibration to the driver due to the pressure changes
caused by the motor and valve operations in a very short period of time. And, keep in mind that
the output and vehicle speed could be decreased without rpm increase due to the ASR function
that controls the engine power. -
-
-
ARP Operation
During the ARP operation, vehicle safety (rollover prevention) takes the first priority and thus,
stronger engine control is in effect. Consequently, the vehicle speed decreases rapidly, so the
driver must take caution for the vehicle may drift away from the lane. -

09-8
Steering wheel angle sensor
Appearance change due to changed multifunction switch
4. CHANGES IN ESP
Steering wheel angle sensor changed ▶
Wheel speed sensor changed ▶
Wheel speed sensor
Front Rear Front Rear
Connector's appearance and length changed
Sensor cluster changed ▶
Sensor cluster
Appearance and its connector (6-pin → 4-pin) changed

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1. ESP (Electronic Stability Program)
As the single-track vehicle model used for the calculations is only valid for a vehicle moving forward,
ESP intervention never takes place during backup.
The ESP system includes the ABS/EBD and ASR systems allowing the system to be able to operate
depending to the vehicle driving conditions.
1) Overview
For example, when the brakes are applied during cornering at the speed of 100 km/h, the ABS will
operate at the same time the ASR or ABD systems operate to reduce the power from the slipping
wheel. And when yaw rate sensor detects the rate exceeding 4 degree/seconds, the ESP system
is activated to apply the brake force to the corresponding wheel to compensate the yaw moment
with the vehicle stability control function. This may cause a problem in vehicle control system due
to multi-operation of systems, thus there is a priority as below:
TCS (ASR or ABD) ＞ ESP ＞ ABS (This is subject to the driving and vehicle conditions.)

09-10
Pressure Sensor
InstalledRemoved
2. LAYOUT
HECU (Hydraulic &
Electronic Control Unit)
ESP ABS
Front Wheel Speed Sensor
4WD 2WDRear Wheel Speed
Sensor
1) Exterior Components

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(2) Interior Components
ESP Indicator
Sensor Cluster
ESP OFF Switch
Steering Wheel Angle
SensorWarning buzzer
(ESP, PAS buzzer)
Located in ICM box
ESP warning and indicator lamp
ESP OFF indicator lamp
ABS warning lamp
Parking brake operating indicator (EBD warning lamp:
both parking brake operating indicator and ABS warning
lamp come on at the same time) 1.
2.
3.
4.
ESP buzzer

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2) Operation of ESP System
(1) Under steering
What is understeering? ▶
ESP controls during understeer ▶ Understeer is a term for a condition in which the steering wheel is steered to a certain angle during
driving and the front tires slip toward the reverse direction of the desired direction. Generally, vehicles
are designed to have understeer. It is because that the vehicle can return back to inside of cornering
line when the steering wheel is steered toward the inside even when the front wheels are slipped
outward.
As the centrifugal force increases, the tires can easily lose the traction and the vehicle tends to slip
outward when the curve angle gets bigger and the speed increases.
The ESP system recognizes the directional angle with the steering wheel angle sensor and senses the
slipping route that occurs reversely against the vehicle cornering direction during understeer with the
yaw rate sensor and lateral sensor. Then, the ESP system applies the braking force to the rear inner
wheel to compensate the yaw moment value. In this way, the vehicle does not lose its driving direction
and the driver can steer the vehicle as intended.